Input Filters

Input from terminals is cooked by an input filter which handles certain special conditions. Input filters have a flag which indicates the options related to inputting characters to the terminal.

Value	Mnuemonic	Description
1	TIFF_Binary	Don't cook input
2	TIFF_Noecho	Don't echo characters
4	TIFF_NoControl	Echo control codes exactly
8	TIFF_Notypeahead	Don't buffer unsolicited input (no input is buffered while this is set)
16	TIFF_NoTermXON	UOS treats XON/XOFF sent by terminal as data rather than start/stop output
32	TIFF_NoLineEdit	Don't support line editing.
64	TIFF_BSasDEL	Treat backspace as Delete
128	TIFF_NoControlT	Don't provide status for Control-T
256	TIFF_NoControlC	Don't interrupt for Control-C
512	TIFF_NoControlY	Don't interrupt for Control-Y

The input filter is responsible for keeping track of the current position (column and line) on the terminal.